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    Wyświetlanie 1-3 z 3
    Tytuł:
    DAC testing using impulse signals
    Autorzy:
    Vedral, J.
    Fexa, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/221597.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    DAC
    ENOB
    SINAD
    FFT test
    Crest Factor
    Damped Sine Wave
    SINC signal
    Multi-Tone signal
    Opis:
    The Multi-Tone (MT) signal with uniform amplitudes can be used for DAC testing. This paper shows an easier way to generate a MT signal using several impulse signals. The article also analyzes qualities of methods for testing the dynamic parameters of Digital to Analog Converters using an impulse signal. The MT, Damped Sine Wave (DSW) and Sinx/x (SINC) signals will be used as the source for these tests. The Effective Number of Bits (ENOB) and Signal to noise and distortion (SINAD) are evaluated in the frequency domain and they are modified using the Crest Factor (CF) correction and compared with the standard results of the Sine Wave FFT test. The first advantage of the test using an impulse signal is that you need fewer input parameters to create the band signal for testing the DAC. The second one is to reduce the testing time using a band signal in comparison with multiple tests using a single sine wave.
    Źródło:
    Metrology and Measurement Systems; 2012, 19, 1; 105-114
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metal detector excited by frequency-swept signal
    Autorzy:
    Svatoš, J.
    Vedral, J.
    Fexa, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/221024.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metal detection
    polyharmonic signals
    Frequency Sweep
    modelling of electromagnetic induction
    analog signal processing
    Opis:
    This paper describes the theoretical background of electromagnetic induction from metal objects modelling. The response function of a specific case of object shape - a homogenous sphere from ferromagnetic and nonferromagnetic material is introduced. Experimental data measured by a metal detector excited with a linearly frequency-swept signal are presented. As a testing target various spheres from different materials and sizes were used. These results should lead to better identification of the buried object.
    Źródło:
    Metrology and Measurement Systems; 2011, 18, 1; 57-67
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of poly-harmonic signals to eddy-current metal detectors and to advanced classification of metals
    Autorzy:
    Svatoš, J.
    Pospíšil, T.
    Vedral, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/220481.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    eddy current
    metal detector
    polyharmonic signal
    signal processing
    classification
    Opis:
    A limited ability to discriminate between different materials is the fundamental problem with all conventional eddy-current-based metal detectors. This paper presents the use, evaluation and classification of nontraditional excitation signals for eddy-current metal detectors to improve their detection and discrimination ability. The presented multi-frequency excitation signals are as follows: a step sweep sine wave, a linear frequency sweep and sin(x)/x signals. All signals are evaluated in the frequency domain. Amplitude and phase spectra and polar graphs of the detector output signal are used for classification and discrimination of the tested objects. Four different classifiers are presented. The classification results obtained with the use of poly-harmonic signals are compared with those obtained with a classical single-tone method. Multi-frequency signals provide more detailed information, due to the response function - the frequency characteristic of a detected object, than standard single-tone methods. Based on the measurements and analysis, a metal object can be better distinguished than when using a single-tone method.
    Źródło:
    Metrology and Measurement Systems; 2018, 25, 2; 387-402
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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